Code timing and verbosity
To help with the scaling tests, I have introduced two levels of verbosity.
- './swift -v 1' makes the MPI rank 1 write timing information to stdout.
- './swift -v 2' makes all MPI ranks write timing information to stdout.
- './swift' suppresses all timing information to stdout.
The 'error()' and 'message()' macros now also print the date and time.